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Article: Tensile deformation of silver micro-wires of small thickness-to-grain-size ratios
Title | Tensile deformation of silver micro-wires of small thickness-to-grain-size ratios | ||||
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Authors | |||||
Keywords | Coupled effect Dislocation densities Dislocation microstructures Grain size Polycrystalline | ||||
Issue Date | 2012 | ||||
Publisher | Elsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/msea | ||||
Citation | Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2012, v. 539, p. 74-84 How to Cite? | ||||
Abstract | A recent letter from us has indicated that the tensile proof strength of polycrystalline Ag micro-wires, with thicknesses in the range from 20 to 50. μm, depends strongly on the specimen size (t) and weakly on the grain size (d) when t/. d becomes smaller than about 3. In this work, we report further coupled effects of specimen size and grain size in the regime when their ratio is small. At a given grain size from 3 to 40. μm, the tensile elongation was found to decrease as the wire thickness decreases, and as the t/. d ratio gets smaller than about 3, the tensile elongation loses its dependence on the grain size. The work-hardening rate was found to scale approximately with the proof strength, and so they should be controlled by the same metallurgical factors. Transmission electron microscopy examination of the dislocation microstructures showed that in the regime where the grain size dominates strength and ductility, the dislocation density rises rapidly on deformation, but in the regime where the specimen thickness dominates strength and ductility, the dislocation density remains on the same order of magnitude as the undeformed state. The easy escape of dislocations from the specimen is thought to be the reason for the observed size effect of strength. © 2012 Elsevier B.V. | ||||
Persistent Identifier | http://hdl.handle.net/10722/145894 | ||||
ISSN | 2023 Impact Factor: 6.1 2023 SCImago Journal Rankings: 1.660 | ||||
ISI Accession Number ID |
Funding Information: We thank Dr. George Greene for providing the Ag wire. The work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administration Region, PR China (Project No. HKU7159/10E). |
DC Field | Value | Language |
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dc.contributor.author | Chen, XX | en_US |
dc.contributor.author | Ngan, AHW | en_US |
dc.date.accessioned | 2012-03-27T09:01:08Z | - |
dc.date.available | 2012-03-27T09:01:08Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.citation | Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2012, v. 539, p. 74-84 | en_US |
dc.identifier.issn | 0921-5093 | - |
dc.identifier.uri | http://hdl.handle.net/10722/145894 | - |
dc.description.abstract | A recent letter from us has indicated that the tensile proof strength of polycrystalline Ag micro-wires, with thicknesses in the range from 20 to 50. μm, depends strongly on the specimen size (t) and weakly on the grain size (d) when t/. d becomes smaller than about 3. In this work, we report further coupled effects of specimen size and grain size in the regime when their ratio is small. At a given grain size from 3 to 40. μm, the tensile elongation was found to decrease as the wire thickness decreases, and as the t/. d ratio gets smaller than about 3, the tensile elongation loses its dependence on the grain size. The work-hardening rate was found to scale approximately with the proof strength, and so they should be controlled by the same metallurgical factors. Transmission electron microscopy examination of the dislocation microstructures showed that in the regime where the grain size dominates strength and ductility, the dislocation density rises rapidly on deformation, but in the regime where the specimen thickness dominates strength and ductility, the dislocation density remains on the same order of magnitude as the undeformed state. The easy escape of dislocations from the specimen is thought to be the reason for the observed size effect of strength. © 2012 Elsevier B.V. | - |
dc.language | eng | en_US |
dc.publisher | Elsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/msea | en_US |
dc.relation.ispartof | Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing | en_US |
dc.rights | NOTICE: this is the author’s version of a work that was accepted for publication in Materials Science and Engineering A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, 2012, v. 539, p. 74-84. DOI: 10.1016/j.msea.2012.01.054 | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | Coupled effect | - |
dc.subject | Dislocation densities | - |
dc.subject | Dislocation microstructures | - |
dc.subject | Grain size | - |
dc.subject | Polycrystalline | - |
dc.title | Tensile deformation of silver micro-wires of small thickness-to-grain-size ratios | en_US |
dc.type | Article | en_US |
dc.identifier.email | Ngan, AHW: hwngan@hkucc.hku.hk | en_US |
dc.identifier.authority | Ngan, AHW=rp00225 | en_US |
dc.description.nature | postprint | - |
dc.identifier.doi | 10.1016/j.msea.2012.01.054 | - |
dc.identifier.scopus | eid_2-s2.0-84862790088 | - |
dc.identifier.hkuros | 198999 | en_US |
dc.identifier.volume | 539 | en_US |
dc.identifier.spage | 74 | en_US |
dc.identifier.epage | 84 | en_US |
dc.identifier.isi | WOS:000302047300012 | - |
dc.publisher.place | Switzerland | - |
dc.identifier.citeulike | 10429927 | - |
dc.identifier.issnl | 0921-5093 | - |